| 一种改进的带正反馈的主动频移法仿真 |
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| 引用本文： | 薛士龙,蒋晨,耿攀,李帆.一种改进的带正反馈的主动频移法仿真[J].上海海事大学学报,2015,36(1):75-80. |
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| 作者姓名： | 薛士龙 蒋晨 耿攀 李帆 |
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| 作者单位： | 上海海事大学 物流工程学院,上海海事大学 物流工程学院,上海海事大学 物流工程学院,上海海事大学 物流工程学院 |
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| 基金项目： | 国家自然科学基金（61374132）；上海海事大学研究生创新基金（2013ycx007） |
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| 摘 要： | 为提高光伏发电系统孤岛检测性能,在带正反馈的主动频移(Active Frequency Drift with Positive Feedback,AFDPF)法的基础上,将初始斩波因子设置为公共耦合点(Point of Common Coupling,PCC)电压频率的函数,设计一种变初始斩波因子的AFDPF法.基于Qf0×Cnorm坐标系分析比较两种AFDPF法的检测盲区,并在MATLAB/Simulink环境下,对单相光伏并网发电系统的孤岛检测进行仿真.结果表明:使用AFDPF法时,反馈系数的大小与孤岛检测速度成正比,与检测盲区成反比;改进的AFDPF法可以根据负载的性质改变初始扰动的方向,检测盲区的位置也会随之向上或向下移动;改进的AFDPF法不仅适用于容性负载和感性负载,而且可减小检测盲区和加快检测速度.
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| 关 键 词： | 孤岛检测 正反馈 初始斩波因子 检测盲区 带正反馈的主动频移 |
| 收稿时间： | 2014/3/16 0:00:00 |
| 修稿时间： | 2014/6/23 0:00:00 |
Simulation on an improved active frequency drift with positive feedback method |
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| Institution: | Shanghai Maritime University+Logistics Engineering College,Shanghai Maritime University+Logistics Engineering College |
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| Abstract: | To improve the islanding detection performance of photovoltaic system, the initial chopping fraction is set as a function of the voltage frequency of the Point of Common Coupling (PCC), and then the Active Frequency Drift with Positive Feedback (AFDPF) method with a changeable initial chopping fraction is designed based on the AFDPF method. Non Detection Zones (NDZs) of the two methods are analyzed and compared in the Qf0×Cnorm coordinate system, and the islanding detection of the single phase photovoltaic grid connected system is simulated in the environment of MATLAB/Simulink. The results verify that: the feedback coefficient is directly proportional to the islanding detection rate and inversely proportional to the size of NDZ when using AFDPF method; the direction of the initial disturbance varies with the nature of the load, and then the position of NDZ moves upward or downward when using the improved AFDPF method; the improved AFDPF method not only applies to capacitive load and inductive load, but also can reduce NDZ and accelerate the detection rate. |
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| Keywords: | islanding detection positive feedback initial chopping fraction non detection zone Active Frequency Drift with Positive Feedback (AFDPF) |
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